Air-preheater for furnaces.



H.- J. PARKER.

AIR PREHEATER FOR FURNACES.

APPLICATION FILED MAR.13, 1908.

907,395. Patented Dec. 22, 1908.

11v VENTOR,

A TTORNE Y WITNESSES I citizen of the United States, resid' land, in the county of Alameda an State' o'f UNITED STATES OFFICE.

HARRY J, PARKER, or OAKL'AND, oarreonivm, ASSIGNOROFONE-HALF '10 rrHon-As 0. Mason,-

- OF LQS ANGELE S, CALIFORNIA.

ain rnnnnama FOR masons.

Specification of Letters Patent.

' Patented. Dec. 22, .1908.

Application as larch 18,1908; Serial-11o. 420,888,

To all whom 'it may concern: Be it known that I, HARRY J. PARKER, a

at Oak- California, have invented new and useful Improvements in Air-Prehea-ters for Furnaces, of which the tion.

following is a specificarovide an improve apparatus for use in H urnaces, and especially in oil burning .fur-

. purgose'has been found to be comparatively 1ne cientin that the air is not raised to a sufficiently high temperature." The object of the .present apparatus is .to pre-heat the 7 air much more highly than heretofore, thus burning the oil with greater'economy and p pipes 11, are all below the floor 9 of the fur efficiency. l

In the accompan g drawing, Figure 1 is a broken horizonta section of-the furnace,

. partly above and partly. below the floor of zlej5., -passes betweenupper doors 7, which,. in the ordinary operation of the furnace, are so that no air can pass the furnace proper; Fig. 2 is a vertical transverse section on the line 22 of Fig. 1; Fig.

'3 is a'broken front view of the furnace.

Referring to the drawing, 1 indicates the combustion chamber of a furnace, having suitable'w'alls 2 and an arched top 3. An

oilsu-pply' pipe 6, whichterminates in a noz maintained closed therethrough, but the air for combustion is supplied through en lower doors 8 below the upper doors. lhe floor. 9' of the combustion chamber is space from the bottom of the furnace, and the urnace has abut .ments 16 extending inwards from its side Walls and dividing the combustion chamber 1- from the front burner ch mber- 17. Said floor 9 extends under the w oleof the combustion chamber except for an aperture-lo-.

cated substantially centrally therein, but the front portion of the floor, in the burner chamber, extends onl under'the mediate portion of said burner-c amber. [Around saidaperture, and between the floor 9 and the bottom of the furnace, are a front wall 12, a rear wall 13, an d side walls 15, forming a well, extending from the bottom of the furnace to said floor 9. Side walls 19 extend from the front of the furnace below the floor and in line with the side walls of the well, and a central The object of the resent invention is to' .the too rapid contraction an 'rangement, all

nace, and the rearwall 13 of the well isspaced from the rear wall of the. furnace but is con-,

@1120 leads from thefront wall of the fur nected. to said rear wall by a central wall 22.

to form return air conduits 14. Said air conduits lead to: the front ofthe furnace below the abutments 16 and communicate with burner chamber over the ed es of the floor in said chamber. Arranged ongitudinally in said well are a considerable number of ipes 11 of refractory material, the ends of the pipes being inserted in the front and rear walls of the well, and thus leading from the air chambers in front to the return air conduits 14 at the rear. v

The walls 12, 13, and 15, as well as the said furnace in which the pipes 11 are ex-' posed to radiant-heat from the flames of the urnace at substantially its hottest oint.

By means of this construction, t e air is .divided intojcomparatively small se arate streamsand receive the full benefit of t e radiant heat from the furnace. In all prior constructions so far as my knowledge eir-o tends although the temperature in the furnace might be from 3,500 degrees Fahrenheit upwardisfthe air would not be raised to a higher tem rature than 400 derees Fahrenhei-t'at t e time. it arived at t e burner, while I find that, with my improved apipae to ratus, thetemperature of the air is raise about 1500 degrees Fahrenheit.

of this. is that the oil is more completely vaporized and the combustion is more erfect, so that a savingin fuel is effected of a out 40 percent. 'Moreover the efficien'cy of a furnace .of a given size is greatly increased, ow-' ingto the fact that a greater amount of fuel can be vaporized and burned, and therefore a muchgreater heat obtained.

An important advantage of this invention is that it prevents leakage which, with furnaces at present-in use, takes dplace owing to expansion of the boilers, due to the influx of cold air which freely im inges against the boiler surface,- when the re re extin gases when starting. Wi the present arof t e airor gas is compelled The effect I ished, or of. hot

v to pass through the finely divided conduits of refractory material before passing to the boiler, so that the temperature ofthe air or gases becomes modified before they reach the boiler, so that contraction and ex ansion of the boiler take place more gradua ily and evenly.

A very important result attained by the use of this invention is that, owing to the very high temperature to which the air of combustion is raised before being su plied to the burner, a very low grade of oi can be used in the burner, as the oil is entirely vaporized owing to the intense heatof the surrounding air supplied thereto, and the asphalturn, which forms the base of California oils, instead of falling down, as in furnaces at present in use, is, in my improved furnace, entirely consumed, so that the entire fuel value of the oil is utilized in the furnace' The intense heat of the air of combustion, which effects the above result, is due to the construction by which the air of combustion is exposed in a large number of com aratively small streams to the heat. 0' the furnace. tained by the present invention is that the temperature in-the stack is greatly reduced. Thus, whereas with ordinary furnaces, burning substantially the same amount and character of fuel, the stack tem erature is between 700 and-800 degrees ahrenheit, it is found that the stack temperature in my improved furnace is from 350 to 450 degrees Fahrenheit. This is believed to be due to the fact that the combustion is concentrated in, or confined to, the furnace itself, so that the heating effect in the stackis reduced.

The arrangement above described is particularly advantageous, for the reason that the air sup ly is in front of the; furnace, immediately below the burner, and can be quickly regulated with the burner. By causing the air to ass throu h the pi es of refractory materia below su stantia y the Another advantageous result at-- hottest point of the flame, and then return by the side air chambers, the air is thoroughly mixed before being supplied to the burner and is supplied thereto at substantially constant tern erature. At the same time the heat is mamtained in the furnace in the most (efficient manner possible. i

I claim A furnace having side, front and rear walls, a floor spaced from the bottom of the furnace, abutments extending inwards from said walls to dividethe s ace above the floor intoa front burner cham fuer and a rear combustion chamber, saicl'fioor extending under the whole of the combustion chamber exce t the floor, and in line with the side walls of the I well, and forming an air inlet chamber, said side walls and those of the well and the rear wall of the well being s aced from the' walls of the furnace to'provi e return air assages beneath said abutments leading to t e front of the furnace, and communicatin with the burner chamber over the ed es of the floor therein, a plurality of pi es 0 refractory material arran ed longitu inally in said well, their ends eing inserted in the front and rear walls thereof, and a door at the front of the furnace opening into the air inlet chamber for controllin the quantity of air admitted thereto, su stantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

HARRY J. PARKER. Witnesses:

F. M. WRIGHT, D. B. Rrcrmnns. 

